#VU81308 Out-of-bounds read in xrdp - CVE-2023-42822

Vulnerability identifier: #VU81308

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-42822

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
xrdp
Other software / Other software solutions

Vendor: neutrinolabs

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in xrdp_painter.c when accessing the font glyphs. A remote user can trigger an out-of-bounds read error and read contents of memory on the system.

Successful exploitation of the vulnerability may lead to system compromise.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

xrdp: 0.9.1 - 0.9.23

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External links
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-2hjx-rm4f-r9hw
https://github.com/neutrinolabs/xrdp/commit/73acbe1f7957c65122b00de4d6f57a8d0d257c40

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.